[TenTec] Ig drift on amps

Jim Brown K9YC k9yc at audiosystemsgroup.com
Sat Feb 7 17:49:07 EST 2009

On Sat, 7 Feb 2009 16:09:07 -0600, Duane Calvin wrote:

>Yes, Ron, I've experienced the same symptoms in my 238B 

Ten Tec uses N1500 caps in the 229 and 238 tuners. Some matching 
conditions cause these caps to carry a lot of current, enough to 
cause them to change value by a fair amount. There are also matching 
conditions that cause them to burn up. I run 229s and 238s with my 
Titan during contests at the 1.2 kw level. I own six of these 
tuners, and I've fried at least one cap in all but one of them. 

On the oldest of my tuners, a 229B, I had enough heating around the 
front end of the rotary inductor to toast the spring that holds the 
traveling tap in contact with the inductor. I managed to repair it 
with a replacement spring that I found in a surplus house. 


Jim K9YC

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